/*
 This source file is part of the Swift.org open source project

 Copyright (c) 2021 Apple Inc. and the Swift project authors
 Licensed under Apache License v2.0 with Runtime Library Exception

 See https://swift.org/LICENSE.txt for license information
 See https://swift.org/CONTRIBUTORS.txt for Swift project authors
*/

import XCTest

@testable import Markdown

final class BasicInlineContainerTests: XCTestCase {
  func testFromSequence() {
    let expectedChildren = Array(repeating: Text("OK"), count: 3)
    let emphasis = Emphasis(expectedChildren)
    let gottenChildren = Array(emphasis.children)
    XCTAssertEqual(expectedChildren.count, gottenChildren.count)
    for (expected, gotten) in zip(expectedChildren, gottenChildren) {
      XCTAssertEqual(expected.debugDescription(), gotten.detachedFromParent.debugDescription())
    }
  }

  func testReplacingChildrenInRange() {
    let emphasis = Emphasis(Array(repeating: Text("OK"), count: 3))
    let id = emphasis._data.id

    do {  // Insert one
      let insertedChild = Text("Inserted")
      var newEmphasis = emphasis
      newEmphasis.replaceChildrenInRange(0..<0, with: CollectionOfOne(insertedChild))
      assertElementDidntChange(
        emphasis, assertedStructure: Emphasis(Array(repeating: Text("OK"), count: 3)),
        expectedId: id)
      XCTAssertEqual(
        insertedChild.debugDescription(),
        (newEmphasis.child(at: 0) as! Text).detachedFromParent.debugDescription())
      XCTAssertEqual(4, newEmphasis.childCount)
    }

    do {  // Insert multiple
      let insertedChildren = Array(repeating: Text("Inserted"), count: 3)
      var newEmphasis = emphasis
      newEmphasis.replaceChildrenInRange(0..<0, with: insertedChildren)
      assertElementDidntChange(
        emphasis, assertedStructure: Emphasis(Array(repeating: Text("OK"), count: 3)),
        expectedId: id)
      let expectedDump = """
        Emphasis
        ├─ Text "Inserted"
        ├─ Text "Inserted"
        ├─ Text "Inserted"
        ├─ Text "OK"
        ├─ Text "OK"
        └─ Text "OK"
        """
      XCTAssertEqual(expectedDump, newEmphasis.debugDescription())
      XCTAssertEqual(6, newEmphasis.childCount)
    }

    do {  // Replace one
      let replacementChild = Text("Replacement")
      var newEmphasis = emphasis
      newEmphasis.replaceChildrenInRange(0..<1, with: CollectionOfOne(replacementChild))
      XCTAssertEqual(
        replacementChild.debugDescription(),
        (newEmphasis.child(at: 0) as! Text).detachedFromParent.debugDescription())
      XCTAssertEqual(3, newEmphasis.childCount)
    }

    do {  // Replace many
      let replacementChild = Text("Replacement")
      var newEmphasis = emphasis
      newEmphasis.replaceChildrenInRange(0..<2, with: CollectionOfOne(replacementChild))
      assertElementDidntChange(
        emphasis, assertedStructure: Emphasis(Array(repeating: Text("OK"), count: 3)),
        expectedId: id)
      let expectedDump = """
        Emphasis
        ├─ Text "Replacement"
        └─ Text "OK"
        """
      XCTAssertEqual(expectedDump, newEmphasis.debugDescription())
      XCTAssertEqual(2, newEmphasis.childCount)
    }

    do {  // Replace all
      let replacementChild = Text("Replacement")
      var newEmphasis = emphasis
      newEmphasis.replaceChildrenInRange(0..<3, with: CollectionOfOne(replacementChild))
      let expectedDump = """
        Emphasis
        └─ Text "Replacement"
        """
      XCTAssertEqual(expectedDump, newEmphasis.debugDescription())
      XCTAssertEqual(1, newEmphasis.childCount)
    }
  }

  func testSetChildren() {
    let document = Paragraph(SoftBreak(), SoftBreak(), SoftBreak())
    var newDocument = document
    newDocument.setInlineChildren([Text("1"), Text("2")])
    let expectedDump = """
      Paragraph
      ├─ Text "1"
      └─ Text "2"
      """
    XCTAssertEqual(expectedDump, newDocument.debugDescription())
  }
}
